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Questions and Answers
What is the color obtained when Dragendorff’s Reagent is used to detect alkaloids?
What is the color obtained when Dragendorff’s Reagent is used to detect alkaloids?
Which reagent is commonly used for the detection of caffeine based on its yellow color obtained?
Which reagent is commonly used for the detection of caffeine based on its yellow color obtained?
What color is typically obtained when mineral acids are used for the detection of alkaloids?
What color is typically obtained when mineral acids are used for the detection of alkaloids?
What chemical composition is present in Marquis Reagent used for detecting amphetamines and opiates?
What chemical composition is present in Marquis Reagent used for detecting amphetamines and opiates?
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In the detection of colchicine, which chemical composition results in a bluish-violet to red color?
In the detection of colchicine, which chemical composition results in a bluish-violet to red color?
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What color is obtained when Hager’s Reagent is used for the detection of alkaloids?
What color is obtained when Hager’s Reagent is used for the detection of alkaloids?
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Which reagent is used for the Murexide Test and results in a purple color?
Which reagent is used for the Murexide Test and results in a purple color?
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Which reagent, when used, results in a reddish-brown color in the presence of alkaloids?
Which reagent, when used, results in a reddish-brown color in the presence of alkaloids?
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What color is typically obtained when Tannic acid is used for the detection of alkaloids?
What color is typically obtained when Tannic acid is used for the detection of alkaloids?
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Which chemical composition is present in Dragendorff’s Reagent?
Which chemical composition is present in Dragendorff’s Reagent?
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In the detection of morphine, what chemical composition results in a deep purplish red color?
In the detection of morphine, what chemical composition results in a deep purplish red color?
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Study Notes
Reagents Used in Detection of Alkaloids
- Mayer's Reagent: potassium mercuric iodide solution, produces a cream-colored reaction
- Wagner's Reagent: solution of iodine in potassium iodide, produces a reddish-brown reaction
- Dragendorff's Reagent: potassium bismuth iodide solution, produces a reddish-brown reaction
- Hager's Reagent: saturated solution of picric acid, produces a yellow reaction
- Picrolonic acid: picrolonic acid solution, produces a yellow reaction
- Tannic acid: produces a yellow crystalline precipitate
Reagents Used in Detection of Specific Alkaloids
- Murexide Test: potassium chlorate, HCl, and NH3, produces a purple reaction (caffeine)
- Mineral acids: phosphotungstic acid and phosphomolybdic acid, produce a yellow reaction
- Acidic p-methyl aminobenzaldehyde: p-methylaminobenzaldehyde and sulfuric acid, produces a bluish-violet to red reaction (colchicine)
- Nitric acid: dilute nitric acid, produces an orange-red reaction (indole)
- Marquis Reagent: formaldehyde and concentrated sulfuric acid, produces:
- Purple to black reaction (ecstasy)
- Orange to brown reaction (amphetamine)
- Deep purplish-red reaction (morphine)
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Description
This quiz covers various reagents used in the detection of alkaloids, their chemical composition, and the color obtained as a result. Examples include Mayer's Reagent, Wagner's Reagent, Dragendorff's Reagent, Hager's Reagent, and Picrolonic acid.
